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0345423399
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note
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There is also a shoulder on the short-wavelength side of the more intense "red" band which resembles the shoulder observed for dilute solutions of the monomer. None of the spectra shown in Figures 5-7 are concentration-dependent.
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17
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0344992266
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note
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We expect, in a "well folded" cofacial structure, that the excitonic splitting (allowed-forbidden character) may be more pronounced than in the somewhat bent structures.
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18
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0005714052
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Birks, J. B. Nature 1967, 214, 1187.
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0003024205
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As suggested by a reviewer, a "TICT" state could be involved in such isomerization processes. Previous papers have reported evidence for twisted excited states as intermediates in merocyanine isomerization (e.g.: Harriman, A. J. Photochem. Photobiol. A: Chem. 1992, 65, 79).
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0031045058
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22
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0344129700
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note
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For the merocyanine dimers, several folded configurations are possible. MC simulations indicate an edge-to-face configuration is one minimum. Two limiting face-to-face configurations (one with the chomophores aligned parallel and one with them antiparallel) are possible and reasonable on energetic grounds. It is not possible to determine which configuration or configurations may exists for either the ground or the excited (excimer) state. For purposes of illustration, we assume a "parallel" folded arrangement.
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23
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0345423398
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note
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If the configuration results in strong face-face or edge-edge interactions, we may anticipate that the difference between the "allowed" (short wavelength) and "forbidden" components of the split bands may be very great. Thus, for example, with the intermolecular "H" aggregates of squaraines, we are able only to detect the short-wavelength band in absorption, while for corresponding aggregates of stilbenes, only the short-wavelength transition is readily observable in absorption but emission clearly originates from a "hidden" lower energy "forbidden" state.
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28
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84986437005
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